Fabrication And Characterization Of Porous And Bio-Activated Surface On Pure Titanium

The porous structure of bioactivity ceramic oxide coatings were formed on pure titanium by microarc oxidation (MAO). The bioactivity of porous oxide coatings were examined by soaking in simulated body fluid (SBF), and apatite coatings were formed on the suface of porous oxide coatings after alkali treatment and soaking in fast calcification solution (FCS). The optimum process of porous ceramic oxide coatings on pure titanium by MAO method were studied by using X-ray diffraction (XRD), scanning electron microscopy (SEM), electron probe microanalyzer (EPMA) and Fourier transform infrared spectroscopy (FT-IR). The existence of calcium and phosphate in electrolyte, the entrance mechanism of calcium and phosphate and the bioactivity theory of porous titanium were researched.The results show that after MAO treatment, the porous structure was formed on the surface of oxide coatings. With the coatings phases and the titanium substrate bonding well. Anatase and rutile TiO₂ were the main composition of the coatings. The process of MAO included the following stages. Firstly, the components of electrolyte were involved in the plasma oxidation reactiona. As while, the voltage and frequency of the power were main electrical parameters. Secondly, with voltage increasing or frequency decreasing, the porousity on the surface of ceramic oxide coatings decreased, but pore size and the thickness of porous layer increased, and the surface becomed coarse. At the same time, anatase TiO₂ changed into rutile type, and the friction-critical load declined. Based on the analysis above,...